Re: [BackupPC-users] Problems with hardlink-based backups...
2009-08-31 16:44:44
Les Mikesell wrote at about 15:08:24 -0500 on Monday, August 31, 2009:
> Jeffrey J. Kosowsky wrote:
> >
> > This still is not a solution for all of us. First, I store the backups
> > on a consumer-level NAS device that does not easily facilitate adding
> > partitions without additional hacking and risks to data integrity.
>
> OK, but when drives are available for around $100/TB these days, how
> much is it worth to deal with the limitations of some inflexible device?
> And even the consumer-level devices should permit a disk replacement
> with mirror rebuild.
>
> > I really fail to understand the dogged resistance to finding a viable
> > solution to a well-known and repeated issue with BackupPC that does
> > not rely on filesystem level kludges.
>
> It isn't a matter of resistance. It is just that no one has shown that
> any other scheme will work any better. What you have to do is reduce
> the head motion necessary to access each file. One pass across the raw
> device clearly does that. A mix of sql and files might or might not.
> Throw in the need to verify/fix out of sync tables and I'd guess not -
> but I'd be happy to be proven wrong.
>
> > I could see if this were given
> > as a temporary workaround but why should we continue to see this as
> > the ideal solution rather than trying to work on a more robust and
> > comprehensive solution even if it falls to a long-term roadmap item.
>
> Pushing the de-duping into the block level filesystem so the app doesn't
> have to do anything special is probably the next step but unless that
> filesystem also provides an incremental block-level backup method (like
> zfs send/receive) you still aren't going to like what has to happen in a
> file-oriented copy of what will appear to be 10x the size. Or maybe
> solid state devices will become cheap enough soon so we won't have to
> think about seek times any more.
Copying/moving/resizing the Backup database is not my only or even
most important reason for advocating a real database solution. I think
I once gave a list of about 10 advantages of a database
solution. Also, I am not looking for the *fastest* way to backup/move/resize a
BackupPC system but rather a feasible way that works in cases where
you don't have a dedicated filesystem. If you are worried about speed,
you can always do a low level block copy in any implementation.
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- Re: [BackupPC-users] Problems with hardlink-based backups..., (continued)
- Re: [BackupPC-users] Problems with hardlink-based backups..., Holger Parplies
- Re: [BackupPC-users] Problems with hardlink-based backups..., Jeffrey J. Kosowsky
- Re: [BackupPC-users] Problems with hardlink-based backups..., Jim Leonard
- Re: [BackupPC-users] Problems with hardlink-based backups..., Jeffrey J. Kosowsky
- Re: [BackupPC-users] Problems with hardlink-based backups..., Michael Stowe
- Re: [BackupPC-users] Problems with hardlink-based backups..., Jim Leonard
- Re: [BackupPC-users] Problems with hardlink-based backups..., Les Mikesell
- Re: [BackupPC-users] Problems with hardlink-based backups...,
Jeffrey J. Kosowsky <=
- Re: [BackupPC-users] Problems with hardlink-based backups..., Jon Craig
- Re: [BackupPC-users] Problems with hardlink-based backups..., Michael Stowe
- Re: [BackupPC-users] Problems with hardlink-based backups..., Jeffrey J. Kosowsky
- Re: [BackupPC-users] Problems with hardlink-based backups..., Peter Walter
- Re: [BackupPC-users] Problems with hardlink-based backups..., Jim Leonard
- Re: [BackupPC-users] Problems with hardlink-based backups..., Jeffrey J. Kosowsky
- Re: [BackupPC-users] Problems with hardlink-based backups..., Peter Walter
- Re: [BackupPC-users] Problems with hardlink-based backups..., Les Mikesell
- Re: [BackupPC-users] Problems with hardlink-based backups..., Peter Walter
- Re: [BackupPC-users] Problems with hardlink-based backups..., Marty
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